Diurnal Photosystem II Photochemical Efficiency and Biomass Partitioning in Acacia mellifera and Acacia laeta Seedlings Under Drying Soil
Öz
Aim of study: The study aimed to assess the impact of drying soil on diurnal photochemical efficiency of photosystem II and biomass partitioning of the seedlings of Acaia mellifera (Mf) and Acacia laeta (Lt).
Study area: The study was conducted at the nursery of Department of Forestry & Range Sciences, Faculty of Environmental Sciences and Natural Resources, University of Al Fashir, North Darfur, Sudan.
Materials and methods: Thirty-six seedlings of two-months old per each species were selected for study. A half of seedlings per species was kept well-watered and the other was exposed to five drought cycles before exposed to continuous drying.
Main results: The results of chlorophyll fluorescence study were indicated that both species are capable to maintain sound photosynthetic machinery throughout the course of measurements. Mf manifested higher biomass production compared to Lt in control seedlings. Conversely, repeated drying cycles techniques were likely improved growth and production in Lt. Strong negative relationships were established between ΔF/Fm' and incident photosynthetically active radiation (PAR), and between Fv/Fm and leaf temperature (T).
Highlights: Under the intermittent irrigation conditions during dry season in general A. mellifera would show better growth hence greater potentials for live fence and afforestation purposes in semi-arid environments compared to A. laeta.
Anahtar Kelimeler
Chlorophyll fluorescence,Dry matter allocation,Water stress,Acacia mellifera,Acacia laeta
Kaynakça
- Aref, I.M. & El-Juhany, L.I. (2001). Impact of sudden water stress on the growth of eight acacia species). Alexandria Science Exchange Journal, 22 (4), 413-422.
- Awodola, A. M. (1991). Effect of soil moisture on the growth of seedlings of Acacia albida (Del.) and Acacia seyal (Del.). Nigerian Journal of Forestry, 21(1-2), 35-37.
- Axelsson, R. & Hanan, N.P. (2017). Patterns in woody vegetation structure across African Savannas. Biogeoscience, 14, 3239-3252.
- Balaguer, L., Pugnaire, F.I., Martinez-Ferri, E., Armas, C., Valladares, F. & Manrique, E. (2002). Ecophysiological significance of chlorophyll loss and reduced photochemical efficiency under extreme aridity in Stipa tenacissima L. Plant and Soil, 240, 343-352.
- Boyer, J.S. (1970). Leaf enlargement and metabolic rates in corn, soybean, and sunflower at various leaf water potentials. Plant Physiology, 46, 233-235.
- Chartzoulakis, K., Noitsakis, B. & Therios, I. (1993). Photosynthesis, plant growth and dry matter distribution in Kiwifruit as influenced by water deficits. Irrigation Science, 14, 1-5.
- Chen, L. & Cheng, L. (2009). Photosystem 2 is more tolerant to high temperature in apple (Malus domastica Borkh) leaves than fruit peel. Photosynthetica, 47(1), 112-120.
- Deans, J.D., Diagne, O., Nizinski, J., Lindley, D.K., Seck, M., Ingleby, K. & Munro, R.C. (2003). Comparative growth, biomass production, nitrogen use, and soil amelioration by nitrogen-fixing tree species in semi-arid Senegal. Forest Ecology and Management, 176, 253-264.
- Eltayb, M.T.A. & Mohamed, A.G. (2013). Feasible grafting Acacia mellifera (Vahl) young seedlings onto young seedlings of other acacias to improve performance on gum production. Journal of Applied and Industrial Sciences, 1(2), 41-50.
- Eshete, G. &Stahl, G. (1998). Functions for multi-phase assessment of biomass in acacia woodlands of the Rift Valley of Ethiopia. Forest Ecology and Management, 105, 79-90.